Coordination CompoundHard

Question

Which of the following complex has zero magnetic moment (spin only)?

Options

A.[Ni(NH3)6]Cl
B.Na3[FeF6]
C.[Cr(H2O)5SO4]
D.K4[Fe(CN)6]

Solution

[Ni(NH3)6]Cl2       sp3d2 hybridisation 2 unpaired electrons
Na3[FeF6]             sp3d2 hybridisation 3 unpaired electrons
[Cr(H2O)6SO4]    sp3d2 hybridisation No unpaired electrons
Zero magnetic moment means all the electrons paired.

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